Hey Growmie,
It's going to be very hard to judge if the plant is ready for harvest without having anything to check the trichomes, those are the key to knowing when the plant is done and also ensuring that you'll get the best THC levels out of the plant. Feel free to shoot me a holler if you ever need any help, I'd be honored to assist you. Hopefully, this was helpful, and remember ... "Happy Growing" and "Free your mind one puff at a time".